android/src/com/android/tools/idea/gradle/project/LibraryAttachments.java

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.tools.idea.gradle.project;

import com.google.common.collect.*;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.roots.JavadocOrderRootType;
import com.intellij.openapi.roots.OrderRootType;
import com.intellij.openapi.roots.impl.libraries.ProjectLibraryTable;
import com.intellij.openapi.roots.libraries.Library;
import com.intellij.openapi.roots.libraries.LibraryTable;
import com.intellij.openapi.util.Key;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;

import static com.intellij.openapi.roots.OrderRootType.SOURCES;

public class LibraryAttachments {
  @NotNull static final List<OrderRootType> SUPPORTED_TYPES = Lists.newArrayList(SOURCES, JavadocOrderRootType.getInstance());

  private static final Key<LibraryAttachments> LIBRARY_ATTACHMENTS = Key.create("project.library.attachments");

  @NotNull private final Project myProject;
  @NotNull private final Map<OrderRootType, Multimap<String, String>> myAttachementsByType;

  @Nullable
  public static LibraryAttachments getStoredLibraryAttachments(@NotNull Project project) {
    return project.getUserData(LIBRARY_ATTACHMENTS);
  }

  public static void removeLibrariesAndStoreAttachments(@NotNull Project project) {
    LibraryTable libraryTable = ProjectLibraryTable.getInstance(project);
    LibraryTable.ModifiableModel model = libraryTable.getModifiableModel();
    try {
      Map<OrderRootType, Multimap<String, String>> attachmentsByType = Maps.newHashMap();

      for (Library library : model.getLibraries()) {
        for (OrderRootType type : SUPPORTED_TYPES) {
          Multimap<String, String> attachments = ArrayListMultimap.create();
          String name = library.getName();
          if (name != null) {
            String[] urls = library.getUrls(type);
            for (String url : urls) {
              attachments.put(name, url);
            }
          }
          attachmentsByType.put(type, attachments);
        }
        model.removeLibrary(library);
      }
      project.putUserData(LIBRARY_ATTACHMENTS, new LibraryAttachments(project, attachmentsByType));
    }
    finally {
      model.commit();
    }
  }

  private LibraryAttachments(@NotNull Project project, @NotNull Map<OrderRootType, Multimap<String, String>> attachementsByType) {
    myProject = project;
    myAttachementsByType = attachementsByType;
  }

  public void addUrlsTo(@NotNull Library.ModifiableModel libraryModel) {
    for (OrderRootType type : myAttachementsByType.keySet()) {
      Multimap<String, String> attachmentsByLibraryName = myAttachementsByType.get(type);
      if (attachmentsByLibraryName != null) {
        Collection<String> attachments = attachmentsByLibraryName.get(libraryModel.getName());
        addUrlsToLibrary(type, libraryModel, attachments);
      }
    }
  }

  private static void addUrlsToLibrary(@NotNull OrderRootType type,
                                       @NotNull Library.ModifiableModel libraryModel,
                                       @NotNull Collection<String> urls) {
    if (!urls.isEmpty()) {
      Set<String> existing = Sets.newHashSet(libraryModel.getUrls(type));
      for (String url : urls) {
        if (!existing.contains(url)) {
          libraryModel.addRoot(url, type);
        }
      }
    }
  }

  public void removeFromProject() {
    myProject.putUserData(LIBRARY_ATTACHMENTS, null);
  }
}